Hadith #2584 (Sahih al-Bukhari)
Book: Peacemaking
Narrator(s): Umm Kulthum bint 'Uqba
Grade: Sahih

That she heard Allah’s Messenger (ﷺ) saying, “He who makes peace between the people by inventing good information or saying good things, is not a liar.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-2584/